Sink



FIG. 1 is a top perspective view of a sink embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear plan view thereof, the front plan view being identical thereto; and,

FIG. 4 is a left side plan view thereof, the right plan view being identical thereto. 

CLAIM The ornamental design for a sink, as shown and described. 